Fig. 4.

(a) Numerical blood vessel phantom that is used for the study (dimensions are in millimeters). (b–f) Reconstructed photoacoustic images using k-wave interpolated, LSQR with heuristic choice of λ, LSQR with optimal choice of λ, Basis pursuit deconvolution (BPD) with heuristic choice of λ in LSQR framework, BPD with optimal choice of λ in LSQR framework, respectively. (g) One-dimensional cross-sectional plot for the results presented in (a),(c),(d),(e), and (f) along the dotted line shown in (a).